Optical imaging lens device

Abstract

An optical imaging lens device includes, in order from an object side to an image side: a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, a sixth lens element having an object-side surface being convex in a paraxial region thereof and an image-side surface being concave in a paraxial region thereof, the object-side and image-side surfaces of the sixth lens element being provided with at least one inflection point, at least one of the object-side and image-side surfaces of the sixth lens element having a sagittal height in a first axis, a sagittal height in a second axis and a sagittal height in a third axis, and at least two of these sagittal heights being different. The optical imaging lens device may meet the needs of miniaturization, wide field of view and low distortion.

What is claimed is: 
     
       1. An optical imaging lens device, comprising a plurality of lens elements each having an object-side surface facing an object side and an image-side surface facing an image side, and the plurality of lens elements comprise, in order from the object side to the image side:
 a first lens element with negative refractive power; 
 a second lens element with positive refractive power, having the image-side surface being convex in a paraxial region thereof; 
 a third lens element with negative refractive power, having the image-side surface being concave in a paraxial region thereof; 
 a fourth lens element with positive refractive power, having the object-side surface being convex in a paraxial region thereof; 
 a fifth lens element with positive refractive power, having the object-side surface being convex in a paraxial region thereof; 
 a sixth lens element with negative refractive power, having the object-side surface being convex in a paraxial region thereof and the image-side surface being concave in a paraxial region thereof, and the object-side surface and the image-side surface of the sixth lens element being provided with at least one inflection point, 
 wherein at least one of the object-side surface and the image-side surface of the sixth lens element has a first sagittal height in a first axis, a second sagittal height in a second axis and a third sagittal height in a third axis, at least two of the first, second and third sagittal heights are different, and the first axis, the second axis and the third axis are not parallel to one another and are perpendicular to an optical axis; and 
 wherein a focal length of the optical imaging lens device is f, a refractive index of the third lens element is N3, an Abbe number of the third lens element is V3, a focal length of the fourth lens element is f4, a refractive index of the fourth lens element is N4, an Abbe number of the fourth lens element is V4, a focal length of the fifth lens element is f5, a refractive index of the fifth lens element is N5, an Abbe number of the fifth lens element is V5, an Abbe number of the sixth lens element is V6, a refractive index of the sixth lens element is N6, a distance from the object-side surface of the first lens element to an image plane along the optical axis is TTL, a distance from the object-side surface of the first lens element to the image-side surface of the sixth lens element along the optical axis is FT, and the following condition is satisfied:
   0<( | f/f 5|− | f/f 4|)<1.3;
 
   70<( V 3/ N 3+ V 4/ N 4+ V 5/ N 5+ V 6/ N 6)<125; or 
   0.4<( FT/TTL )<0.92. 
 
 
     
     
       2. The optical imaging lens device as claimed in  claim 1 , wherein a distance between the object-side surface and the image-side surface of the third lens element in the optical axis is CT3, a distance between the object-side surface and the image-side surface of the fourth lens element in the optical axis is CT4, and the following condition is further satisfied:
   0.1< CT 3/ CT 4<0.5. 
 
     
     
       3. The optical imaging lens device as claimed in  claim 1 , wherein the Abbe number of the third lens element is V3, the Abbe number of the fourth lens element is V4, the Abbe number of the fifth lens element is V5, the Abbe number of the sixth lens element is V6, and the following condition is further satisfied:
   ( V 4+ V 5)−( V 3+ V 6)>65
 
 
     
     
       4. The optical imaging lens device as claimed in  claim 1 , wherein the distance from the object-side surface of the first lens element to the image plane along the optical axis is TTL, the maximum diagonal imaging height of the optical imaging lens device is ImgH, and the following condition is further satisfied:
   (2* TTL )/Img H< 2.35. 
 
     
     
       5. The optical imaging lens device as claimed in  claim 1 , wherein a focal length of the second lens element is f2, the focal length of the optical imaging lens device is f, and the following condition is further satisfied:
   1< f 2/ f< 1.24. 
 
     
     
       6. The optical imaging lens device as claimed in  claim 1 , wherein a radius of curvature of the object-side surface of the fifth lens element is R9, a radius of curvature of the image-side surface of the fifth lens element is R10, and the following condition is further satisfied:
   −1<( R 9+ R 10)/( R 9− R 10)<0.8.
 
 
     
     
       7. The optical imaging lens device as claimed in  claim 1 , wherein the focal length of the optical imaging lens device is f, a distance between the image-side surface of the third lens element and the object-side surface of the fourth lens element in the optical axis is T34, a distance between the image-side surface of the fourth lens element and the object-side surface of the fifth lens element in the optical axis is T45, and the following condition is further satisfied:
   0.5<( T 34+ T 45)*10/ f< 2.5. 
 
     
     
       8. The optical imaging lens device as claimed in  claim 1 , wherein the Abbe number of the fourth lens element is V4, the Abbe number of the sixth lens element is V6, and the following condition is further satisfied:
   1.5< V 4/ V 6<3. 
 
     
     
       9. The optical imaging lens device as claimed in  claim 1 , wherein at least one of the first, second, third, fourth and fifth lens elements is aspheric. 
     
     
       10. The optical imaging lens device as claimed in  claim 1 , wherein the object-side surface of the first lens element is convex in a paraxial region thereof, the image-side surface of the first lens element is concave in a paraxial region thereof, the object-side surface of the second lens element is convex in a paraxial region thereof; the object-side surface of the third lens element is convex in a paraxial region thereof, the image-side surface of the fourth lens element is concave in a paraxial region thereof, and the image-side surface of the fifth lens element is concave in a paraxial region thereof. 
     
     
       11. The optical imaging lens device as claimed in  claim 1 , wherein the object-side surface of the first lens element is convex in a paraxial region thereof, the image-side surface of the first lens element is concave in a paraxial region thereof, the object-side surface of the second lens element is convex in a paraxial region thereof; the object-side surface of the third lens element is convex in a paraxial region thereof, the image-side surface of the fourth lens element is convex in a paraxial region thereof, and the image-side surface of the fifth lens element is convex in a paraxial region thereof. 
     
     
       12. The optical imaging lens device as claimed in  claim 1 , wherein the object-side surface of the first lens element is convex in a paraxial region thereof, the image-side surface of the first lens element is concave in a paraxial region thereof, the object-side surface of the second lens element is convex in a paraxial region thereof; the object-side surface of the third lens element is convex in a paraxial region thereof, the image-side surface of the fourth lens element is concave in a paraxial region thereof, and the image-side surface of the fifth lens element is convex in a paraxial region thereof.